(inner mass of cells) functions during fetal period but degenerates soon after birth

produces D -5,3-b -hydroxy steroids (100-200 mg/day)

differentiation of permanent cortex (outer mass of cells) begins during late fetal period

Zona glomerulosa

and fasciculata are present at birth; Zona reticularis appears near end of 3rd year after birth.

Medulla

– neuroectodermal cells migrate from the neural crest of the trunk region into the region of celiac ganglia and on to the developing suprarenal cortex – these cells populate the central region of the gland

this migration continues to birth

epinephrine and norepinephrine are produced and secreted by different cell types